[Sidefx-houdini-list] Sprites and Mantra
Andrew D Lyons
tstexture at gmail.com
Mon Oct 16 13:43:57 EDT 2006
Have a look at this thread.
Sets the maximum opacity that will be considered non-opaque. Setting
this value below 1 allows speedups in scenes with transparency.
Maybe try that with Mario's shader code.
On 16/10/06, Andrew D Lyons <tstexture at gmail.com> wrote:
> I had this problem once with leaf shapes on square cards. I seem to
> remember something being added to mantra afterwards which solved this
> problem. Maybe it was this (look in deep raster tab of mantra rop):
> Sample Filters (Mantra)
> A sample filter determines how a list of samples is collapsed to a
> single sample value, for later application of a Pixel Filter. Sample
> lists will usually only have a single entry for a fully opaque
> surface, but may be larger when many semi-transparent objects cover
> that pixel. Sample filters are only available for deep raster planes.
> * Closest surface - The value from the closest surface is selected.
> * Opacity filtering - The sample values are composited using the
> surface opacities.
> For extreme power in post-processing rendered frames, render into the
> compositor and use the compositor to process the frames.
> So I'm guessing you should try "Opacity filtering". Give it a whirl
> and tell us if it works. Sorry for not being more helpful if it
> doesn't. :)
> On 16/10/06, Jean-Claude <jclaude at mimgfx.com> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
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> > Hi Guys,
> > I'm having problems with sprites that now i cant even count how many I have...
> > but I need a solution for this first problem... how do I tell mantra .... how many overlapping sprites to consider?
> > is there a sort of "ray depth"?... I have a sphere which emit static particles... and such particles are shaded with a
> > VOP shader which makes a gradient opacity...
> > when sprites overlap (quite always in my case) I've got a square.. with black area where it should be transparent...
> > Alpha in mplay is what I'd expect.. its ok... but color... nope.
> > thanks for any help....
> > p.s. I'm trying to make a smoke effect with sprites...
> > - --
> > .: jean-claude
> > .: mimgfx dot com
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> Andrew D Lyons | Digital Artist | http://www.tstex.com
Andrew D Lyons | Digital Artist | http://www.tstex.com
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